Manufacture of sugar



Jan. 8, L935. c, SQHWIEVGER 1,986,858

MANUFACTURE OF SUGAR Filed Oct. '7, 1930 WHITE SUGAR .Z'ExP/RAi-ION 1T EUGAR' E/vp NOLA-$555 INVENT OR.

CHA RL E5 5 CHW/EGER BY Patented Jan. 8, 1935 m 1,986,858 j oF ,SUGAR v *Charles'Schwieger, deceased, late of Lage,Ger-

' ..many,;:by Alfred, Schwiegenadministrator, San

;;Francisco, Calif by decree assignments, to; Schwieger Chemical 00., Inc.,

3 San vFrancisco, .Calif.,

of court and mesne a corporation of cam,

Application October, 7, 1930, ScrialNo. 487,074" I The present invention relatesto improvements the manufacture ofsuganand isa continuation m part --of the; co -pending application Serial 1 present invention is-to' provide certaindeparture's,

from the process conventionally employed and to make certain changesin the succession of the steps whereby the entire processis rendered The preferred method of carrying out the in vention is illustrated in the accompanying draw- 2 ing, in which:

Figure 1 schematically illustrates the various steps followed in the process; I i Referring to the drawing in detail, the sugar beets are first sliced or shredded and treated for 25 extraction of the raw juice in the diffusion-cells indicated at 1 in the manner ployed in sugar beet factories. ed at this point that the principal steps of the process apply to the manufacture of cane sugar as well as of beet sugar, and if it is tobe used in connection with the manufacture of cane sugar, the raw juice may be produced in the manner commonly employed for extracting the same from sugar cane. I l I 35 From the diffusion cells the raw juice passes through the conventional measuring tank 2 preferably at a temperature of sixty-two degrees centigrade and is measured into one of the three tanks 3 which may be referred to as the lime sep- 40 aration tanks. In these tanks the raw sugar juice is mixed with lime, preferably in the proportion of from 1%% to 2 of CaO in the case of beet sugar juice and of from 1 to 2% of CaO in the case of cane sugar juice. Ammonium 45 carbonate preferably from 65 to 75 grams per 250 cubic feet of raw juice is added, and furthernow commonly emmore from 25% to 50% of the green syrup is added gained from a previous process and taken much more economical than was possiblewith It should be nottained is kept at a temperature ofsubstantially period of about fifteen minutes-i l separation tanksjthe juice thus ninety degrees centigradand is agitatedlfor a i From the lime treated is pumped into the first carbonationtank indicated at 4 where it is subjected to a process of carbonation, thelatterprocess being carried out in such a manner that it results in an alkalinity of CaQQthe best percentage of alkalinity witliin the range indicated depending 'up'ontli'e sugar com tent of the beets and other conditions to be established by experiment in the individual case.

From the first carbonization tank thejjuice is passed in a conventional manner through the 'heater 5 and is filtered in the first filtration presses 6. From the filter presses the thin juice passes into the chemical tank 7 where it again is treated withammonium carbonate preferably in ,the proportion of 65 to 75 grams of ammonium carbonate to 250 cubic feet of juice and is agitated for from two to four minutes preferably at a temperature of ninety degrees, centigrade, wherefupon it is successively passed through the evapo- .rators marked I, II and III so as to go through three stages, ofevaporation. From the third evaporator the thickened juice is conducted into the second carbonation tank 8 where the juice is treated to a second carbonation with a resulting alkalinity f .02% CaO to 04% CaO.

From the second carbonation tank the juice passes through the second presses indicated at 9, to the first sulfitation tank 10 in which sulfitation is carried on in the conventional manner.

From the first sulfitation tank the juice then passes through a third filtration press 11 and into the fourth evaporator marked IV, where it is further evaporated in accordance with conventional methods. through a second stage of sulfitation in the tank 12, and the fourth filtration press 13 into the the mixture o'f'from.15%"CaO to .05%

The thick juice then passes thick juice tank 14. From this tank it passes through the conventional vacuum pan 15 and the centrifugal separator 16 which separates the white sugar from the molasses. From 25% to 50% of the molasses is returned to the first lime separationtanks for the purposes set forth at the beginning of the specification, while the remainder of the molasses is conducted for further treatment to the second vacuum pan 1'7 and to the second centrifugal separators 18 with a re- 1 sulting separation into second product sugar and .end molasses. The second product sugar may be carried back to the tank 14 for further treatment with the contents of said tank.

It should be understood that suitable equivalents may be used for the various elements set forth hereinabove and more particularly that 'monium carbonate by adding :ammonimn carhe .ratepf from :65116 175 grams ammonium bicarbonate is to be considered the full equivalent of ammonium carbonate.

What *Zis-claimed iis, 1. In lthe process of manufacturing sugar, the method of subjecting the rawjuice to a process of lime separation and a process of carbonation with a resulting alkalinity of from .15 .to .Q\CaO and in treating the resulting mixture with'ambonate at the rate of from 65 to 'l5grams per'250 cubic feet of mixture.

2. In the process of manufacturingsugar, the method of subjecting the raw juice to 'aprocess of lime separation in the presence of ammonium carbonate, to a process of carbonation withza resulting alkalinity of from .15 to .05 02.0 and in treating the resulting mixture with ammonium carbonate by;adding .ammonium carbonate at .per 250 cubic with ammonium carbonate and thereafter partly evaporating the-juice, of subjecting the :partly evaporated juice to a second stage .of carbonation, of filtering the resulting juice and subjecting the same to a process of sulfitation, of again filtering the resulting juice and of subjecting the same to a final evaporation.

4. In the process of manufacturing sugar the method or subjecting raw juice to lime separation, then to a process df carbonation,'loilheating and filtering the resulting juice, of treating the ilatiter with ammonium carbonate and. thereafter .partly evaporating the juice, of subjecting the partly evaporated juice to a second stage of car- ;bonation, ofifilteringthe resulting juice and subjectin'githe same 'to a process of sulfitation, of

' -again' filteringthe resulting juice and of subjecting the same "to-a final evaporation.

5. The process 'o'fimanufacturing sugar which comprises the steps of subjecting raw juice in .the presence pix-green syrup and ammonium carbonate to lime separation, then to a process of carbonation with a resulting alkalinity of .15 to .05 of filtering the resulting ,juice, of treating the latter with ammonium icarbonate .and there after (partly evaporating the-juice, .ar {subjecting the 'fpartly evaporatedliuicefto a second stage or carbonation'with a resulting alkalinity .0 2% .to 04%, of filtering .theiresultiigljuice and of subjecting the filtered juicelto alfinal evaporation.

m V AALEREDSCHWIEIGER, Adminitratorlof we. Estate of. C'haailes schufleger, Deceased. f 

